ESTEEMED MASTER: 



On the completion of your twenty-five years of service at Harvard University, 

 we your pupils seek through this volume to express our devotion to you as our erst- 

 while teacher, as the advocate of the highest ideals in scientific work, and as the trainer 

 of investigators and teachers in zoology. 



We recall with pride the service that was done science by the publication of your 

 work on the Maturation, Fecundation, and Segmentation of the Egg of Limax a 

 work that introduced into America the then new cytological methods in the application 

 of which this country has since reached an elevated position. It likewise introduced 

 into zoology a proper fulness and accuracy of citation and a convenient and uniform 

 method of referring from text to bibliography. It marked a step forward, also, in 

 thoroughness and detail, and in the full recognition that, even in zoology, as in physics 

 and chemistry, method is hardly less important than matter. These ideals in produc- 

 tive scholarship have been retained throughout the series of researches issued by 

 yourself and your pupils. 



Much more personal and more precious to us has been your work in training 

 zoologists. We call to mind your rigorous preliminary methods that gave us self- 

 reliance, and your constant advice and encouragement ; and we have keen and grateful 

 recollections of the critical skill with which you discussed with us our completed studies. 



But the memories that we cherish most, the inspiration and the stimulus that 

 have abided longest, depend on certain traits of your character of which this is not 

 the fitting place to make analysis, and of which only your students fully appreciate 

 the influence. Your geniality, your sympathy, and especially your scientific honesty 

 and justice the influence of these on your pupils no less than your scholarship have 

 inspired this tribute of affection and loyalty. 

 GLOVER MORRILL ALLEN, Secretary of the Boston Society of Natural History, Boston, 



Mass. 



JAMES ALDERSON BAILEY, Jr., Barristers Hall, Boston, Mass. 

 FRANCIS NOTES BALCH, Jamaica Plain, Mass. 



FRANK WATTS BANCROFT, Instructor in Physiology, University of California, Berke- 

 ley, Cal. 



HARRY GARDNER BARBER, Teacher of Biology, DeWitt Clinton High School, New 

 York, N. Y. 



